Abstract
Vitamin E is a fat-soluble vitamin that consists of four different tocopherol and tocotrienol isomers (α, β, γ and δ). Homogentisate phytyltransferase (HPT) catalyses the condensation of homogentisate (HGA) and phytyl diphosphate (PDP). The HGA serves as precursors for the synthesis of tocopherols, tocotrienols and also plastoquinol-9 (PQ-9) in chloroplasts of plants. The condensation of PDP and HGA by HPT will produce intermediate product for tocopherol production. In addition, condensation of HGA and geranylgeranyl diphosphate (GGDP) by homogentisate geranylgeranyl transferase (HGGT) will produce tocotrienols. Meanwhile, tocopherol cyclase forms the chromanol head group of the various tocopherol and tocotrienol isomers. Medical evidence suggests that vitamin E especially α-tocotrienol which can be found in seeds and cereal grains protects the cells against cancer, strong antioxidant and an effective neuroprotector.
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Abbreviations
- DMPBQ:
-
2-methyl-6-phytylbenzoquinol
- DMGGBQ:
-
2, 3-dimethyl-5-geranylgeranyl benzoquinol
- GGDP Reductase:
-
geranylgeranyl diphosphate reductase
- GGDP:
-
Geranylgeranyl diphosphate
- HGA:
-
Homogentisate
- HGGT:
-
Homogentisate geranylgeranyl transferase
- HPP:
-
p-hydroxyphenylpyruvate
- HPPD:
-
p-hydroxyphenolpyruvate dioxygenase
- HPT:
-
Homogentisate phytyltransferase
- MGGBQ:
-
2-Methyl-6-geranylgeranylbenzoquinol
- PDP:
-
Phytyl diphosphate
- PQ-9:
-
Plastoquinol-9
- PrBQMT:
-
2-methyl-6-prenylbenzoquinol methyltransferase
- TC:
-
Tocopherol cyclase
- γ-TMT:
-
Gamma-tocopherol methyltransferase
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Munusamy, U., Abdullah, S.N.A. (2019). Vitamin E. In: Ozturk, M., Hakeem, K. (eds) Plant and Human Health, Volume 2. Springer, Cham. https://doi.org/10.1007/978-3-030-03344-6_15
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